As described by SSA:
"One of the Social Security Administration’s (SSA) highest priorities is to support the efforts of disabled beneficiaries who want to work by developing policies and services to help them reach their employment goal. The Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) programs include a number of employment support provisions commonly referred to as work incentives.
The Red Book is a general reference tool designed to provide a working knowledge of these provisions. We write the Red Book primarily for educators, advocates, rehabilitation professionals, and counselors who serve persons with disabilities. We also expect that applicants and beneficiaries will use it as a self-help guide.
The Red Book contains a general description of our disability-related policies. For information specific to your situation regarding eligibility or benefits, you may need to contact us. You will find contact information on, HOW TO REACH SOCIAL SECURITY."